5 kV Signal Isolated, High Speed (16 Mbps), ESD Protected, Full Duplex RS-485 Transceiver

The ADM2490E is an isolated data transceiver with ±8 kV ESD protection that is suitable for high speed, full-duplex communication on multipoint transmission lines. It is designed for balanced transmission lines and complies with ANSI TIA/EIA-485-A-1998 and ISO 8482: 1987(E). The device employs Analog Devices, Inc., iCoupler® technology to combine a 2-channel isolator, a three-state differential line driver, and a differential input receiver into a single package.

The differential transmitter outputs and receiver inputs feature electrostatic discharge circuitry that provides protection to ±8 kV using the human body model (HBM). The logic side of the device can be powered with either a 5 V or a 3 V supply, whereas the bus side requires an isolated 5 V supply.

The device has current-limiting and thermal shutdown features to protect against output short circuits and situations where bus contention could cause excessive power dissipation.

The ADM2490E is available in a wide body, 16-lead SOIC package and operates over the −40°C to +105°C temperature range.

Applications

* Isolated RS-485/RS-422 Interfaces

* Industrial Field Networks

* INTERBUS

* Multipoint Data Transmission Systems

* Isolated, full-duplex RS-485/RS-422 transceiver

* ±8 kV ESD protection on RS-485 input/output pins

* 16 Mbps data rate

* Complies with ANSI TIA/EIA-485-A-1998 and ISO 8482: 1987(E)

* Suitable for 5 V or 3 V operation (VDD1)

* High common-mode transient immunity: >25 kV/μs

* Receiver has open-circuit, fail-safe design

* 32 nodes on the bus

* Thermal shutdown protection